Telkomsel LTE FDD Interworking Strategy for L1800 & U900, U2100

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Telkomsel LTE Interworking Strategy (LTE1800 + U900 + U2100 + GSM) www.huawei.com

Overview of Interworking Strategy Idle Mode • • • • •

Reselection within same LTE frequency layer: Intra-frequency reselection based on coverage Reselection between L900, L1800 are Inter-Frequency reselection based on coverage LTE  U900/U2100/G1800: Reselection based on coverage (G900 not involved since only S1/1/1 ) U900/U2100/G1800/G900  LTE: Reselection based on priority (L1800 has higher priority than L900) 2G/3G interworking to L900 will be deleted after all L900 shutdown

LTE

UMTS 2100

LTE

UMTS 2100

LTE

UMTS 2100

L1800

Same priority within LTE

L900

Different Priority

F1, F2, F3

Higher priority for

U2100

from 3G/2G

L2U reselection Low priority for L2U

UMTS 900

F4 U900

UMTS 900

reselection. If U900 already continuously coverage then can set high priority

GSM 1800

GSM 1800 GSM 900

GSM 1800

G1800 G900

Coverage Trigger  Priority Trigger 

Inter-RAT  – Idle Mode Cell Reselection •

Propose to set L900 to higher reselection priority than U2100 & GSM1800/900.

•

LTE capable UE always prefer to camp on LTE due to higher cell priority than UMTS/GSM.

•

•

•

UE prefer to reselect to U2100 only when LTE signal is low and UMTS signal fulfill the cell reselection triggering threshold. Only U2100 is not available and U900 is available then reselect to U900.  Absolute priority will be set for both LTE and UMTS network to facilitate cell reselection preference to LTE network.  Absolute priority ranges from 0 to 7, where 7 indicate the highest priority and 0 indicate the lowest priority.

 L900

and L1800 are same

priority within LTE layer   U2100

and U900 are same

priority within 3G layer 

Priority

Telkomsel System

7

LTE 1800

6

LTE 900

Range use for LTE/Future Use

5 4

UMTS 2100

3

UMTS 900

Range use for UMTS

2

1 0

GSM

Range use for GSM

Overview of Interworking Strategy Connected Mode • • •

•

HO within LTE same frequency: Intra-frequency handover based on coverage HO between LTE different frequency: Inter-Freq HO triggered by coverage, and by LTE cell load (MLB: Mobility Load Balance) LTE  U2100/G1800: Inter-RAT PS Redirection for PS service, CSFB by redirection for CS service (G900 not involved). Blind redirection will be adapt when U900 co-located with LTE UMTS & GSM LTE: Redirection for PS Service (fast return only co-locate with LTE), 3G to LTE service based redirection 

LTE

LTE

LTE

U900 is not considered for L2U interworking for

LTE 

connection mode mobility before U900 is continuous coverage.  Also

U2100

U2100

U2100

F1~F4 UMTS

U900 quality need

to monitor considering uplink interference on 900MHz band.

U900

CSFB

GSM 1800

GSM 1800

GSM 1800

G1800

Load Based redirection (MLB) Coverage Based PS redirection

GSM 900

GSM 900

GSM 900

G900 G->L Fast Return



Fast Return will not enable on U900 cells since it has bigger coverage than L1800.

U->L Fast Return



In future if U900 is verified good performance and continuous coverage, then can

U2L service based redirection

consider Interworking to U900 instead of U2100 by blind redirection

Thank you www.huawei.com